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1. Fill in the parentheses with proper words
(a) A ( hypothesis ) is a tentative explanation
5. Perform the indicated operations and give or prediction concerning some
answers with the proper number of significant phenomenon.
figures. (10 pts) (b) A scientific ( theory ) provides
explanations of observed natural
phenomena and predictions that can be (0.307 g . 14.2 mg . 3.52 mg)
tested by further experiments. (1.22 cm . 0.28 mm) × 0.752 cm × 0.51 cm
(c) The ( precision ) of a set of experiments
= 0.289 g/0.46 cm = 0.63 g/cm3
refers to how closely individual
measurements agree with one another.
(d) Atoms that have the same number of
protons but different numbers of neutrons
6. Naturally occurring strontium consists of the
are called ( isotopes ).
following isotopes. Calculate the weighted
average atomic mass of strontium. (10 pts)